Question

tính giá trị biểu thức

7/9 x 2/3 + 3/4 : 2/5=........

1/6 + 3/4 + 5/2 : 1/9=.......

Answer 1

\(\dfrac{7}{9}\times\dfrac{2}{3}+\dfrac{3}{4}:\dfrac{2}{5}\)

\(=\dfrac{14}{27}+\dfrac{15}{8}\)

\(=\dfrac{517}{216}\)

\(\dfrac{1}{6}+\dfrac{3}{4}+\dfrac{5}{2}:\dfrac{1}{9}\)

\(=\dfrac{1}{6}+\dfrac{3}{4}+\dfrac{45}{2}\)

\(=\dfrac{281}{12}\)